From the perspective of an iPhone user. This is the next gen task/project management tool. Life and business is not a list of todos like call that person or walk the dog, that can be checked as done. It is a collection of ongoing developments of different projects. Like playing whack a mole. Nothing is ever really completed.
Enter Agenda where the workflow exactly mimics the thought process of managing your different agendas.
From the project notes you can see and decide if they are on the agenda. Then from the agenda folder you can see if they all have a time assigned to them. If not, you can directly find a time that does not conflict with other appointments.
That last feature is the best integration I have seen with entries in the iOS calendar. Checklists with single tasks are made inside the note.
Combine this with Eventail as a widget viewer of your calendar, and the Fantastical widget as countdown to next event.
You are now completely free to manage things to do on a set time vs today vs on the agenda but not assigned a time yet.
With the iOS calendar integration Agenda does not need to do everything themselves but can let other apps do what they do best.
Make the notes more Kanban styled.
In the agenda folder sort on time assigned, so unassigned are top. Or make 2 agenda folders, 1 with no time assigned as default and when scheduled move to “Agenda Scheduled”
Then you can clear your mental inbox when everything is scheduled.